Tractor scraper



March 30, 1937. H. B. THORPE TRACTOR SCRAPER Filed Aug; 27, 1935 3Sheets-Sheet l March 30, 1937. H. B. THORPE TRACTOR SCRAPER Filed Aug;27, 1955 3 Sheets-Sheet 2 Invenlor A ltorney March 30, 1937. I H. B.THORPE 2,075,482

TRACTOR SCRAPER Filed Aug. 27, 1955 3 Sheets-Sheet 3 Inventor AttorneyPatented Mar. 30,1931

UNITED STATES PATENT OFFICE 2,075,282 'msc'roa semen Harry BarneyThorpe, Vlsolia, 0011!. Application August 27, 1935, Serial No. 38.1%

Claims. (Cl. 37-144) This invention relates to scrapers for attachmentto a tractor and which may be employed for bulldozing, etc., and anobject o! the invention is to provide a tractor of this character hav- 5ing improved means for mounting the scraper blade and also improvedmeans for varying the angle of the blade with respect to the line ofdraft. a

In accordance with the present invention, hy-

draulic means is provided for changing the angle of the blade wherebythe blade can be easily and quickly changed at the will of the operatorthereby tending to save a great deal of time and ex pense in theoperation thereof and obviates the necessity of backing up'or exchangingthe blade by hand.

The invention together with its objects and advantages will be bestunderstood from a study of the following description taken in connectionwith the accompanying drawings wherein:

Figure l is top plan view illustrating the application of the inventionto-a tractor.

Figure 2 is a detail view taken substantially on the line 2-4 of Figure1.

Figures is an enlarged detail sectional view taken through a guidecylinder and piston assembly.

Figure 4 is a detail sectional view taken substantially on the line 4-4oi. Figure 2; so Figure 5 isaplan view of a reciprocating rod. Figure 6is a view similar to Figure5 showing the reciprocating rod connectedwith one end oi! the piston rod.

Figure '7 is a detail view taken substantially on theline |--1otFlgureZ. l

Figure 8 is a detail view taken substantially on the line H of Figure 1.Figure 9 is an enlarged longitudinal sectional view through the guidemember and reciprocating rod assembly.

Figure 10 is a detail view taken substantially on the line lO-ll ofFigure 2.

Figure 11 is a detail view taken substantially on theline llll ct Figure5 1, Figure 12 is a fragmentary detail sectional view taken on the linelI-il of Figure 11.

Figure 13 is an eievational view of a portion of a cable structure.

Referring tothe drawings by reference numerals it will be seen that theimproved bulldozer comprises a blade I that is of conventional con:structlon and is provided on its rear side with hinge brackets 2 wherebythrough the medium of the hinge pins 3 the blade is connected with oneend or reciprocating rods 4.

Intermediate its ends the blade I at the rear side thereoi is providedwith a similar bracket 5 whereby through the medium of a hinge pin 6 theblade is connected to a headed rod 1 operating through a suitable guidein the cross frame mem- 5 her 8 at the front of the tractor indicatedgenerally by the reference numeral 9. Suitable spring means It isprovided for normally urging the blade I in a forward direction.Provided at opposite sides or the tractor are 10 substantially tubularguide members II, II in one or which issecured by suitably anchoredblocks i2 and as best shown in Figure 3, a cylinder ii in which operatespiston 14 provided with rod l5. 15

The piston rod I8 is connected with a slide rod through the medium or acoupling indicated 4 generally by thereference numeral it. Each rod 4 isprovided with such a coupling 16.

As shown in Figure 10, each coupling I6 is in 20 the form of a blockprovided with a recess ll opening through opposite sides of the blockand through the top of the block. For the recess l'l there is providedacover Ila secured to the block by any suitable fastening means. g y 25Arranged in the recess I! are 'a-pair oi oppo-.

sitely swinging dogs ll normally urgedoutwardly 'through the medium of aspring l9. For-drawcable II is connected as at g: with a 'main cable 3523 that extends toand is suitably connected with! a control lever 24mounted on the tractor.

The cables 23 extend upwardly through suitable substantially conicalshaped housings 28 secured to the cover plates lid of the blocks and 40accommodated in slots 21 provided-in the topot the guide tubes ll.

Cooperable with the dogs II for securing the rods 4 at the desiredprojected or retracted position are suitably shaped notches I8 and IIar- 45 ranged in pairs internally oi the guide tubes H as best shown inFigure 9. As also shown in Figure 9 suitable guide blocks 30 areprovided for the rods 4. It will thus be seen that with the dogs. It inthe projected position shown in Fig- 50 ure 1'0 and engaged in thenotches 28 the rods 4 will be held in a projected position; on the otherhand with the dogs I8 engaged in the notches II rods 4 will be held in aretracted position. In release the dogs from the notches 28 or ll as the5s 2 a case may be, lever 24 is operated for exerting a pull on thecables 23 and associated cables 20 for drawing the dogs I! inwardlbagainst the action of springs I! thus freeing the rods 4 to permit 5 thelatter to move inwardly or outwardly depending upon which end ofcylinder I3 is being charged with fluid for operating the piston ll.

In the present instance but one cylinder i3 is provided and at itsrespective opposite ends is equipped with caps 3|, 3! into which aretapped nipples 33, 34. The nipplesil, 34 are connected by flexibleconduits as, as with a suitable source of fluid supply indicatedgenerally by the reference numeral 31 and arranged in these conduits 35,36 is a suitable control valve 38. It will thus be seen that to swingthe blade I from the transverse position shown in Figure 1 to, forexample, the dotted line position shown, in said figure, valve 38 ismanipulated to permit a supply of oil or the like under pressure to thecylinder it at the cap equipped end 32. The oil entering the cylinderwill then act on the piston M to cause the same to move forwardly p nrelease of the dogs I! from the notches 21!. In this manner,

25 the blade I will be moved to the dotted line position shown in Figure1 and when this position is attained the dogs ll move opposite to andswing outwardly into engagement with the notches 28 for locking the rod4 at the near side of the trac- 30- tor in projected position. In thisconnectionit will be understood that the rod 4 at the opposite side willmove in a reverse direction or to the right in Figure 1 to assume thedotted position shown in Figure 1. Thus it will be seen that the blade Imay be swung to a position diagonal to the line of draft and'either tothe right or left in a quick and efllcient mannen,

To allow for the movement of the blade to the desired angular positionthe guide tubes II at 1 40 theirrear ends are pivoted to a frame Fsuitably mounted on the tractor as clearly shown in -Figure 2. In thisconnection it will be noted that to the rear end of each guide sleeve Iithere issuitably connected a tubular extension 39 which atone end ispivoted to the frame I? through the medium of a pivot pin 40. The tubeextension 39 is provided with upper and lower slots to accommodate thepivot pin II and arranged inthe tube as best shown in Figure 4 is ablock ll having an arcuate notch in one edge to engage the pin 40 asshown. This block 4| is normally urged into engagement with the pin 40through the medium of a suitable coil spring 42. Thus an efficientpivotal connection between 103011 guide tube u and the frame F isprovidedipermitting the necessary swinging movement of the guide tubesincidental to a change in the angular position of the blade 1 relativeto the line of draft.

It is thought that a clear understanding of 0 the invention will be hadfrom' the foregoing and the invention, what is pin and normally urgingthe same forwardly with reference to the tractor, a scraper bladepivoted intermediate its endsto the thrust pin, a pair of guide tubes,spring cushioned devices pivotally connecting the guide tubes at one endthereof to the tractor at opposite sides of the latter, slide rodshaving ends slidably working in the guide tubes and outer ends pivotallyconnected with the scraper blade, hydraulic means connected with theslide rods for reciprocating the latter, and means for holding the guiderods at ime desired projected or retracted position.

'2. In combination with a tractor, a frame carried the eby, a pair ofguide tubes disposed on the tractor a opposite sides of the tractor andpivoted at one end tothe frame, slide rods having ends mounted forreciprocation within the guide tubes, a scraper blade pivoted to theouter end of the slide rods, each of said guide tubes being providedwith longitudinally spaced pairs of opposed notches, and spring presseddogs pivotally mounted on each of the slide rods and adapted to engagethe notches of a selected pair for holding the slide rods at the desiredadjustment.

3. In combination with a tractor, a pair of guide tubes disposed one toeach side of the tractor and pivotally mounted at one end of thetractor, slide rods having ends slidably working within said guidetubes, 9. scraper blade pivoted to the free ends of said slide rods, acylinder mounted in at least one of saidguide tubes, a piston mountedfor reciprocation in said cylinder and having a rod connected with aslide rod, hydraulic means connected with the cylinder for reciprocatingthe piston for varying the angle of the scraper blade with respect tothe line of draft. and latch means associated with each slide rod andits guide tube whereby the guide rods may be selectively secured at thedesired adjustment.

4. In combination with a tractor, a frame carried thereby, a thrust pinslidably mounted on 'the forward end of the frame, a scraper bladepivotally mounted on the free end of the thrust pin, a pair of guidetubes disposed one to each side of the tractor and pivotally connectedat one end to the frame, slide rods having ends slidably working in saidguide tubes and free ends pivotally connected'with the scraper blade,hy-

draulic means for reciprocating said slide rods,

and latch means for securing the slide rods at the desired projected orretracted position for securing the" blade at the desired angle relativeto the line of draft.

5. In combination with a tractor, a scraper blade pivotally mounted onthe tractor at the forward end of the latter, and means for swinging theblade to a desired angle with respect to the line of draft, said meansincluding a guide tube, a slide rod having an end slidably working inthe guide tube and a second end hinged to the scraper blade,interengaging means onsaid guide tube and said slide rod for securingthe latter in either a projected or retracted position optionally, acylinder mounted in the guide tube, a piston mounted for reciprocationin the cylinder, and said piston having a rod rigidly connected with theslide rod-for transmitting movement of the piston to the slide rod.

HARRY BURNEY THORPE.

